Circuit/System Description
WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
The BCM supplies a voltage reference through the instrument panel (I/P) dimming voltage reference circuit to the interior lamp dimmer switch, which is part of the headlamp switch. When the dimmer switch is placed in a desired position, reference voltage is applied through the dimmer switch rheostat and the I/P lamps dimmer switch signal circuit to the BCM. The BCM interprets this voltage signal, then applies a pulse width modulated (PWM) voltage, supplied by the SWITCH DM Fuse located in the rear fuse block, through the instrument panel lamp supply voltage circuits illuminating the components listed below.
- Hazard switch
- Ashtray lamp
- Left middle door window switch
- Right middle door window switch
- Traction control switch
- Floor shifter assembly - PRNDL lamp
- Auxiliary HVAC control module
- Garage door opener switch
- Sunroof switch
- Sunshade switch
- Left rear door window switch
- Left rear door heated seat switch
- Left rear door seat lumbar switch
- Right rear door window switch
- Right rear door heated seat switch
- Right rear door seat lumbar switch